<?php

class bmp {

	var $mpdf = null;

	function bmp(&$mpdf) {
		$this->mpdf = $mpdf;
	}


	function _getBMPimage($data, $file) {
		$info = array();
		// Adapted from script by Valentin Schmidt
		// http://staff.dasdeck.de/valentin/fpdf/fpdf_bmp/
		$bfOffBits=$this->_fourbytes2int_le(substr($data,10,4));
		$width=$this->_fourbytes2int_le(substr($data,18,4));
		$height=$this->_fourbytes2int_le(substr($data,22,4));
		$flip = ($height<0);
		if ($flip) $height =-$height;
		$biBitCount=$this->_twobytes2int_le(substr($data,28,2));
		$biCompression=$this->_fourbytes2int_le(substr($data,30,4));
		$info = array('w'=>$width, 'h'=>$height);
		if ($biBitCount<16){
			$info['cs'] = 'Indexed';
			$info['bpc'] = $biBitCount;
			$palStr = substr($data,54,($bfOffBits-54));
			$pal = '';
			$cnt = strlen($palStr)/4;
			for ($i=0;$i<$cnt;$i++){
				$n = 4*$i;
				$pal .= $palStr[$n+2].$palStr[$n+1].$palStr[$n];
			}
			$info['pal'] = $pal;
		}
		else{
			$info['cs'] = 'DeviceRGB';
			$info['bpc'] = 8;
		}

		if ($this->mpdf->restrictColorSpace==1 || $this->mpdf->PDFX || $this->mpdf->restrictColorSpace==3) {
			if (($this->mpdf->PDFA && !$this->mpdf->PDFAauto) || ($this->mpdf->PDFX && !$this->mpdf->PDFXauto)) { $this->mpdf->PDFAXwarnings[] = "Image cannot be converted to suitable colour space for PDFA or PDFX file - ".$file." - (Image replaced by 'no-image'.)"; }
			return array('error' => "BMP Image cannot be converted to suitable colour space - ".$file." - (Image replaced by 'no-image'.)");
		}

		$biXPelsPerMeter=$this->_fourbytes2int_le(substr($data,38,4));	// horizontal pixels per meter, usually set to zero
		//$biYPelsPerMeter=$this->_fourbytes2int_le(substr($data,42,4));	// vertical pixels per meter, usually set to zero
		$biXPelsPerMeter=round($biXPelsPerMeter/1000 *25.4);
		//$biYPelsPerMeter=round($biYPelsPerMeter/1000 *25.4);
		$info['set-dpi'] = $biXPelsPerMeter;

		switch ($biCompression){
			case 0:
				$str = substr($data,$bfOffBits);
				break;
			case 1: # BI_RLE8
				$str = $this->rle8_decode(substr($data,$bfOffBits), $width);
				break;
			case 2: # BI_RLE4
				$str = $this->rle4_decode(substr($data,$bfOffBits), $width);
				break;
		}
		$bmpdata = '';
		$padCnt = (4-ceil(($width/(8/$biBitCount)))%4)%4;
		switch ($biBitCount){
			case 1:
			case 4:
			case 8:
				$w = floor($width/(8/$biBitCount)) + ($width%(8/$biBitCount)?1:0);
				$w_row = $w + $padCnt;
				if ($flip){
					for ($y=0;$y<$height;$y++){
						$y0 = $y*$w_row;
						for ($x=0;$x<$w;$x++)
						$bmpdata .= $str[$y0+$x];
					}
				}else{
					for ($y=$height-1;$y>=0;$y--){
						$y0 = $y*$w_row;
						for ($x=0;$x<$w;$x++)
						$bmpdata .= $str[$y0+$x];
					}
				}
				break;

			case 16:
				$w_row = $width*2 + $padCnt;
				if ($flip){
					for ($y=0;$y<$height;$y++){
						$y0 = $y*$w_row;
						for ($x=0;$x<$width;$x++){
							$n = (ord( $str[$y0 + 2*$x + 1])*256 +    ord( $str[$y0 + 2*$x]));
							$b = ($n & 31)<<3; $g = ($n & 992)>>2; $r = ($n & 31744)>>7128;
							$bmpdata .= chr($r) . chr($g) . chr($b);
						}
					}
				}else{
					for ($y=$height-1;$y>=0;$y--){
						$y0 = $y*$w_row;
						for ($x=0;$x<$width;$x++){
							$n = (ord( $str[$y0 + 2*$x + 1])*256 +    ord( $str[$y0 + 2*$x]));
							$b = ($n & 31)<<3; $g = ($n & 992)>>2; $r = ($n & 31744)>>7;
							$bmpdata .= chr($r) . chr($g) . chr($b);
						}
					}
				}
				break;

			case 24:
			case 32:
				$byteCnt = $biBitCount/8;
				$w_row = $width*$byteCnt + $padCnt;

				if ($flip){
					for ($y=0;$y<$height;$y++){
						$y0 = $y*$w_row;
						for ($x=0;$x<$width;$x++){
							$i = $y0 + $x*$byteCnt ; # + 1
							$bmpdata .= $str[$i+2].$str[$i+1].$str[$i];
						}
					}
				}else{
					for ($y=$height-1;$y>=0;$y--){
						$y0 = $y*$w_row;
						for ($x=0;$x<$width;$x++){
							$i = $y0 + $x*$byteCnt ; # + 1
							$bmpdata .= $str[$i+2].$str[$i+1].$str[$i];
						}
					}
				}
				break;

			default:
				return array('error' => 'Error parsing BMP image - Unsupported image biBitCount');
		}
		if ($this->mpdf->compress) {
			$bmpdata=gzcompress($bmpdata);
			$info['f']='FlateDecode';
		}
		$info['data']=$bmpdata;
		$info['type']='bmp';
		return $info;
	}

	function _fourbytes2int_le($s) {
		//Read a 4-byte integer from string
		return (ord($s[3])<<24) + (ord($s[2])<<16) + (ord($s[1])<<8) + ord($s[0]);
	}

	function _twobytes2int_le($s) {
		//Read a 2-byte integer from string
		return (ord(substr($s, 1, 1))<<8) + ord(substr($s, 0, 1));
	}


	# Decoder for RLE8 compression in windows bitmaps
	# see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_6x0u.asp
	function rle8_decode ($str, $width){
		$lineWidth = $width + (3 - ($width-1) % 4);
		$out = '';
		$cnt = strlen($str);
		for ($i=0;$i<$cnt;$i++){
			$o = ord($str[$i]);
			switch ($o){
				case 0: # ESCAPE
					$i++;
					switch (ord($str[$i])){
						case 0: # NEW LINE
							$padCnt = $lineWidth - strlen($out)%$lineWidth;
							if ($padCnt<$lineWidth) $out .= str_repeat(chr(0), $padCnt); # pad line
							break;
						case 1: # END OF FILE
							$padCnt = $lineWidth - strlen($out)%$lineWidth;
							if ($padCnt<$lineWidth) $out .= str_repeat(chr(0), $padCnt); # pad line
							break 3;
						case 2: # DELTA
							$i += 2;
							break;
						default: # ABSOLUTE MODE
							$num = ord($str[$i]);
							for ($j=0;$j<$num;$j++)
							$out .= $str[++$i];
							if ($num % 2) $i++;
					}
					break;
				default:
					$out .= str_repeat($str[++$i], $o);
			}
		}
		return $out;
	}

	# Decoder for RLE4 compression in windows bitmaps
	# see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_6x0u.asp
	function rle4_decode ($str, $width){
		$w = floor($width/2) + ($width % 2);
		$lineWidth = $w + (3 - ( ($width-1) / 2) % 4);
		$pixels = array();
		$cnt = strlen($str);
		for ($i=0;$i<$cnt;$i++){
			$o = ord($str[$i]);
			switch ($o){
				case 0: # ESCAPE
					$i++;
					switch (ord($str[$i])){
						case 0: # NEW LINE
							while (count($pixels)%$lineWidth!=0)
							$pixels[]=0;
							break;
						case 1: # END OF FILE
							while (count($pixels)%$lineWidth!=0)
							$pixels[]=0;
							break 3;
						case 2: # DELTA
							$i += 2;
							break;
						default: # ABSOLUTE MODE
							$num = ord($str[$i]);
							for ($j=0;$j<$num;$j++){
								if ($j%2==0){
									$c = ord($str[++$i]);
									$pixels[] = ($c & 240)>>4;
								} else
								$pixels[] = $c & 15;
							}
							if ($num % 2) $i++;
					}
					break;
				default:
					$c = ord($str[++$i]);
					for ($j=0;$j<$o;$j++)
					$pixels[] = ($j%2==0 ? ($c & 240)>>4 : $c & 15);
			}
		}

		$out = '';
		if (count($pixels)%2) $pixels[]=0;
		$cnt = count($pixels)/2;
		for ($i=0;$i<$cnt;$i++)
		$out .= chr(16*$pixels[2*$i] + $pixels[2*$i+1]);
		return $out;
	}



}

?>